linux-kernel - Re: [PATCH] soc: renesas: rz-sysc: Suppress binding attributes

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Message-ID: <f979f814-cf9b-43b2-a928-5faa3996724c@tuxon.dev>
Date: Thu, 20 Feb 2025 18:41:51 +0200
From: "claudiu beznea (tuxon)" <claudiu.beznea@...on.dev>
To: Geert Uytterhoeven <geert@...ux-m68k.org>
Cc: magnus.damm@...il.com, john.madieu.xa@...renesas.com,
 linux-renesas-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
 Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
Subject: Re: [PATCH] soc: renesas: rz-sysc: Suppress binding attributes

Hi, Geert,

On 2/20/25 18:00, Geert Uytterhoeven wrote:
> On Sat, 15 Feb 2025 at 14:18, Claudiu <claudiu.beznea@...on.dev> wrote:
>> From: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
>>
>> The matching data for the rz-sysc driver is marked with __initconst, which
>> means it is discarded after initialization. Because of this, attempting to
>> unbind/bind the driver through sysfs after system boot can lead to "Unable
>> to handle kernel paging request at virtual address" errors due to accessing
>> freed memory.
>>
>> Since the System Controller (SYSC) is an essential block for Renesas SoCs,
>> suppress binding attributes to prevent them being exposed in sysfs,
>> avoiding potential issues.
>>
>> Fixes: 1660e5ea6a3e ("soc: renesas: Add SYSC driver for Renesas RZ family")
>> Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
> Reviewed-by: Geert Uytterhoeven <geert+renesas@...der.be>
> i.e. will queue in renesas-devel for v6.15.
>
>>   drivers/soc/renesas/rz-sysc.c | 1 +
> Looks like there are more opportunities for similar changes?

For the other Renesas drivers I wasn't sure if this is the desired way.

Thank you,
Claudiu

>
> Gr{oetje,eeting}s,
>
>                          Geert
>